package com.shi.desktop.searcher;

import java.io.BufferedReader;
import java.io.IOException;

import org.apache.lucene.document.Document;
import org.apache.lucene.index.FilterIndexReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.HitCollector;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.TopDocCollector;

public class TestSearcher {
	private static class OneNormsReader extends FilterIndexReader {
		private String field;

		public OneNormsReader(IndexReader in, String field) {
			super(in);
			this.field = field;
		}

		@Override
		public byte[] norms(String field) throws IOException {
			return in.norms(this.field);
		}
	}

	private TestSearcher() {
	}

	public static void main(String[] args) throws Exception {
		FileSearcher fileSearcher = new FileSearcher();
		
		String keyword = "框架";
		int page = 1;
		int hitsPerPage = 10;
		Document[] docs = fileSearcher.search(keyword, page, hitsPerPage);
		for(int i = 0; i < docs.length; i++) {
			System.out.println("Path: " + docs[i].get("path"));
			System.out.println("Filename: " + docs[i].get("filename"));
		}
	}
	/** Simple command-line based search demo. */
//	public static void main(String[] args) throws Exception {
//		String usage = "Usage:\tjava TestSearcher [-index dir] [-field f] [-repeat n] [-queries file] [-raw] [-norms field] [-paging hitsPerPage]";
//		usage += "\n\tSpecify 'false' for hitsPerPage to use streaming instead of paging search.";
//		if (args.length > 0
//				&& ("-h".equals(args[0]) || "-help".equals(args[0]))) {
//			System.out.println(usage);
//			System.exit(0);
//		}
//
//		String index = "d:\\index";
//		String field = "content";
//		String queries = null;
//		int repeat = 0;
//		boolean raw = false;
//		String normsField = null;
//		boolean paging = true;
//		int hitsPerPage = 10;
//
//		for (int i = 0; i < args.length; i++) {
//			if ("-index".equals(args[i])) {
//				index = args[i + 1];
//				i++;
//			} else if ("-field".equals(args[i])) {
//				field = args[i + 1];
//				i++;
//			} else if ("-queries".equals(args[i])) {
//				queries = args[i + 1];
//				i++;
//			} else if ("-repeat".equals(args[i])) {
//				repeat = Integer.parseInt(args[i + 1]);
//				i++;
//			} else if ("-raw".equals(args[i])) {
//				raw = true;
//			} else if ("-norms".equals(args[i])) {
//				normsField = args[i + 1];
//				i++;
//			} else if ("-paging".equals(args[i])) {
//				if (args[i + 1].equals("false")) {
//					paging = false;
//				} else {
//					hitsPerPage = Integer.parseInt(args[i + 1]);
//					if (hitsPerPage == 0) {
//						paging = false;
//					}
//				}
//				i++;
//			}
//		}
//
//		IndexReader reader = IndexReader.open(index);
//
//		if (normsField != null)
//			reader = new OneNormsReader(reader, normsField);
//
//		Searcher searcher = new IndexSearcher(reader);
//		Analyzer analyzer = new CJKAnalyzer();
//
//		BufferedReader in = null;
//		if (queries != null) {
//			in = new BufferedReader(new FileReader(queries));
//		} else {
//			in = new BufferedReader(new InputStreamReader(System.in, "GBK"));
//		}
//		QueryParser parser = new QueryParser(field, analyzer);
//		while (true) {
//			if (queries == null) // prompt the user
//				System.out.println("Enter query: ");
//
//			String line = in.readLine();
//
//			if (line == null || line.length() == -1)
//				break;
//
//			line = line.trim();
//			if (line.length() == 0)
//				break;
//
//			Query query = parser.parse(line);
//			System.out.println("Searching for: " + query.toString(field));
//
//			if (repeat > 0) { // repeat & time as benchmark
//				Date start = new Date();
//				for (int i = 0; i < repeat; i++) {
//					searcher.search(query, null, 100);
//				}
//				Date end = new Date();
//				System.out.println("Time: " + (end.getTime() - start.getTime())
//						+ "ms");
//			}
//
//			if (paging) {
//				doPagingSearch(in, searcher, query, hitsPerPage, raw,
//						queries == null);
//			} else {
//				doStreamingSearch(searcher, query);
//			}
//		}
//		reader.close();
//	}

	/**
	 * This method uses a custom HitCollector implementation which simply prints
	 * out the docId and score of every matching document.
	 * 
	 * This simulates the streaming search use case, where all hits are supposed
	 * to be processed, regardless of their relevance.
	 */
	public static void doStreamingSearch(final Searcher searcher, Query query)
			throws IOException {
		HitCollector streamingHitCollector = new HitCollector() {

			// simply print docId and score of every matching document
			@Override
			public void collect(int doc, float score) {
				System.out.println("doc=" + doc + " score=" + score);
			}

		};

		searcher.search(query, streamingHitCollector);
	}

	/**
	 * This demonstrates a typical paging search scenario, where the search
	 * engine presents pages of size n to the user. The user can then go to the
	 * next page if interested in the next hits.
	 * 
	 * When the query is executed for the first time, then only enough results
	 * are collected to fill 5 result pages. If the user wants to page beyond
	 * this limit, then the query is executed another time and all hits are
	 * collected.
	 * 
	 */
	public static void doPagingSearch(BufferedReader in, Searcher searcher,
			Query query, int hitsPerPage, boolean raw, boolean interactive)
			throws IOException {

		// Collect enough docs to show 5 pages
		TopDocCollector collector = new TopDocCollector(5 * hitsPerPage);
		searcher.search(query, collector);
		ScoreDoc[] hits = collector.topDocs().scoreDocs;

		int numTotalHits = collector.getTotalHits();
		System.out.println(numTotalHits + " total matching documents");

		int start = 0;
		int end = Math.min(numTotalHits, hitsPerPage);

		while (true) {
			if (end > hits.length) {
				System.out
						.println("Only results 1 - " + hits.length + " of "
								+ numTotalHits
								+ " total matching documents collected.");
				System.out.println("Collect more (y/n) ?");
				String line = in.readLine();
				if (line.length() == 0 || line.charAt(0) == 'n') {
					break;
				}

				collector = new TopDocCollector(numTotalHits);
				searcher.search(query, collector);
				hits = collector.topDocs().scoreDocs;
			}

			end = Math.min(hits.length, start + hitsPerPage);

			for (int i = start; i < end; i++) {
				if (raw) { // output raw format
					System.out.println("doc=" + hits[i].doc + " score="
							+ hits[i].score);
					continue;
				}

				Document doc = searcher.doc(hits[i].doc);
				String path = doc.get("path");
				if (path != null) {
					System.out.println((i + 1) + ". " + path);
					String title = doc.get("title");
					String filename = doc.get("filename");
					if (filename != null) {
						System.out.println("   Filename: " + doc.get("filename"));
					}
					if (title != null) {
						System.out.println("   Title: " + doc.get("title"));
					}
				} else {
					System.out.println((i + 1) + ". "
							+ "No path for this document");
				}

			}

			if (!interactive) {
				break;
			}

			if (numTotalHits >= end) {
				boolean quit = false;
				while (true) {
					System.out.print("Press ");
					if (start - hitsPerPage >= 0) {
						System.out.print("(p)revious page, ");
					}
					if (start + hitsPerPage < numTotalHits) {
						System.out.print("(n)ext page, ");
					}
					System.out
							.println("(q)uit or enter number to jump to a page.");

					String line = in.readLine();
					if (line.length() == 0 || line.charAt(0) == 'q') {
						quit = true;
						break;
					}
					if (line.charAt(0) == 'p') {
						start = Math.max(0, start - hitsPerPage);
						break;
					} else if (line.charAt(0) == 'n') {
						if (start + hitsPerPage < numTotalHits) {
							start += hitsPerPage;
						}
						break;
					} else {
						int page = Integer.parseInt(line);
						if ((page - 1) * hitsPerPage < numTotalHits) {
							start = (page - 1) * hitsPerPage;
							break;
						} else {
							System.out.println("No such page");
						}
					}
				}
				if (quit)
					break;
				end = Math.min(numTotalHits, start + hitsPerPage);
			}

		}

	}
}
